This is just a small part of an extraordinary illustration by artist ulises_f: there are dozens of Doctor Who characters pictured in the full image. The artist has disabled downloading of his/her work at Flickr, and so I’ll honor that by not reproducing the entire piece here. Please click on over to Flickr for the entire image in full size. And don’t miss the separate version that identifies all the characters and creatures pictured.
(Thanks to Erik for the link. If you stumble across a cool Doctor Who thing, feel free to email me with a link.)